# Review of the Primary National Ambient Air Quality Standards for Oxides of Nitrogen
> **Rule** · Final action. · Published 2018-04-18 · Effective 2018-05-18 · 83 FR 17226
## Document
- **Document number:** 2018-07741
- **Category:** air-emissions
- **Federal Register citation:** 83 FR 17226
- **CFR reference:** 40 CFR 50
- **Publication date:** 2018-04-18
- **Effective date:** 2018-05-18
- **EPA docket:** EPA-HQ-OAR-2013-0146
## Abstract

Based on the Environmental Protection Agency's (EPA's) review of the air quality criteria addressing human health effects of oxides of nitrogen and the primary national ambient air quality standards (NAAQS) for oxides of nitrogen, as measured by nitrogen dioxide (NO<INF>2</INF>), the EPA is retaining the current standards, without revision.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2018/04/18/2018-07741/review-of-the-primary-national-ambient-air-quality-standards-for-oxides-of-nitrogen)
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